There are some software that I only have because of AUR. For example, Brother printer drivers.
AUR is a great option to have. It doesn't mean people should use it for everything, when there's a perfectly capable version of the same software downloadable from Arch, Flathub or even through Distrobox.
Having options is a good thing, people just need to take care.
In fact, downloading something from AUR without checking it is hardly more dangerous than adding PPAs in Ubuntu.